Matsya Purana 206.3

206.3

uttarāyaṇaṃ dvādaśī vā tasyāṃ dattaṃ mahāphalam.
āhitāgnirdvijo yastu taddeyaṃ tasya pārthiva .. 206.3 ..

Matsya said:—"On the full moon-day in the month of Vaiśākha, Māgha, Āṣāḍha and Kārtika, on the twelfth lunar day of the sun's progress in the northern path, the giving away of the black deer-skin begets incalculable benefits. It should be given to a Agnihotrī Brāhmaṇa.—2-3